Question: Who is Aisha's sibling?
Paraphrase: Who is Aisha's brother or sister?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P3373 wd:Q4730963 . ?sbj wdt:P31 wd:Q5 } 
Answer: Abdu'l-Rahman ibn Abi Bakr, Muhammad ibn Abi Bakr, Asmā' bint Abu Bakr, Abdullah ibn Abi Bakr, Tufayl ibn al-Harith, Umm Kulthum bint Abi Bakr